外源硫在草甸草原黑钙土中的转化  

Transformation of Added Sulfur in Chernozem of a Meadow Grassland

作　　者：袁新 刘贺永 李天鹏[2] 李岩岩 王斌 冯雪 金兰淑 姜勇[2] YUAN Xin;LIU He-yong;LI Tian-peng;LI Yan-yan;WANG Bin;FENG Xue;JIN Lan-shu;JIANG Yong(College of Land and Environment,Shenyang Agricultural University,Shenyang 110866,China;Erguna Forest-Steppe Ecotone Ecosystem Research Station,Institute of Applied Ecology,Chinese Academy of Sciences,Shenyang 110016,China)

机构地区：[1]沈阳农业大学土地与环境学院,辽宁沈阳110866 [2]中国科学院沈阳应用生态研究所/额尔古纳森林草原过渡带生态系统研究站,辽宁沈阳110016

出　　处：《土壤通报》2022年第5期1140-1147,共8页Chinese Journal of Soil Science

基　　金：国家自然科学基金面上项目(31870441,32071563,31800398)资助。

摘　　要：【目的】探讨元素硫添加后在草甸草原黑钙土中的氧化速率,明确土壤无机S组分的变化特征。【方法】依托内蒙古额尔古纳草甸草原硫磺添加试验平台,测定了元素S添加量(0、1、2、4、6、8、10 t hm^(-2))1年后的表观氧化速率及表层土壤(0~10 cm)各无机硫组分的变化。【结果】研究表明,对照中的土壤全硫含量为627.5 mg kg^(-1),其中无机硫和有机硫分别占2.4%和97.6%。硫添加处理的表土全硫含量分别比对照增加646.5~5182.5 mg kg^(-1),总无机硫分别比对照增加169.4~887.9 mg kg^(-1);硫添加处理中,表土中未氧化的元素硫分别为473.9~4264.0 mg kg^(-1),元素硫的表观氧化速率分别为173.5~271.3 g kg^(-1)a^(-1)。在增加的表土总无机硫中,85.0%~91.9%为(CaCl_(2)浸提),7.8%~17.1%为吸附性硫(Ca(H_(2)PO_(4))_(2)浸提),0.8%~1.6%为难溶性硫(HCl浸提)。土壤无机硫组分与土壤pH呈显著负相关,与土壤电导率呈显著正相关。【结论】外源添加的元素硫主要氧化为植物可利用态的易溶性硫和吸附性硫,而氧化为难溶性硫的比例很低。[Objective] To explore the oxidation rate of elemental sulfur(S) in chernozem of a meadow grassland, and to examine the changes in soil inorganic S fractions. [Method] Based on a field experiment of S addition(with S addition rates of 0, 1, 2, 4, 6, 8 and 10 t hm-2, respectively) conducted in a meadow grassland in Erguna, Inner Mongolia, we determined the apparent oxidation rate and inorganic S fractions in 0-10 cm soil layer after 1 year of elemental S additions. [Result] Total S content was 627.5 mg kg^(-1), with 2.4% inorganic S and 97.6% organic S in the treatment without elemental S addition. Soil total S content increased by 646.5-5182.5 mg kg, and the total inorganic S increased by 169.4-887.9 g kg^(-1) in the S added treatments as compared with the control. The unoxidized elemental S in the surface soil were 473.9-4264.0 g kg^(-1) in the S addition treatments, with an apparent oxidation rate from 173.5-271.3 g kg^(-1)a^(-1), respectively. In the total increased inorganic S, the CaCl_(2) extractable S(soluble S), Ca(H_(2)PO_(4))_(2) extractable S(adsorbed S), and HCl extractable S(insoluble S) accounted for 85.0%-91.9%, 7.8%-17.1%, 0.8%-1.6%,respectively in the surface soil of the S added treatments. Soil inorganic S fractions correlated negatively with soil pH but positively with soil electric conductivity(EC). [Conclusion] The added elemental S were mainly oxidized into plant available S, while the insoluble S only accounted for a small proportion.

关 键 词：草甸草原 硫添加 无机硫组分 氧化速率 黑钙土 

分 类 号：S153.4[农业科学—土壤学]